Paper-bag machine.



W. T; DULIN.

PAPER BAG MACHINE. APPLIOATION FILED DEC. 7, 1912.,

Patented Aug. 5, 1913.

0 RN I flffarney.

UNITED STATES PATENT OFFICE.

WILLIAM Tf DULIN, F PHILADELPHIA, YENNSYLVANIA.

PAPER-BAG MACHINE.

Specification of Letters Patent.

Application filed December 7, 1912.

Patented Aug. 5,1913. Serial No. 735,398.

' which isprovided for making from a con tinuous tube, having an inwardly folded tuck in each side thereof, paper bags comgnonly known as self-opening square paper ags.

The present improvements pertain to that type of paper bag machines which employs a pair of diverging rolls for opening out the leading end of the tucked paper tube into the well known diamond form.-

The object of my improvements is to provide diverging rolls simple in construction and efficient and accurate in operation. c

To properly form the diamond folds with mechanisms of this character it is necessary to have the side clips of the pair of diverging rolls grip the opposite plies of the side tucks of the bag tube oppositely, that is, at the same distance from the end of the tube on which the diamond fold is being formed. As it is necessary or at least highly desirable to have these rolls so close together as to enact in forwarding the bag tube such coincident gripping involves the solution of the problem of preventing the clips on opposits rolls respectively from interfering with one another, particularly as it is desirable to have those clips enter the side tucks directly succeeding the adventof those clips into the common plane of the axes of the rolls. Many ingenious devices for preventing such interference have been proposed and employed with more or less success. The present invention is particularly directed to an improved construction havi a new mode of operation for accomplishing this result.

Before describing the invention in detail I- desire tohave it understood that said invention is not limited to the particular construetion and arrangement of parts which I have illustrated andshall hereinafter describe, and that various changes may be made in the mechanisms shown without departing from the spirit or see e of the inemploy is for the purpose of description and not of limitation.

In their preferred embodiment my improvements comprise features illustrated in the drawings accompanying this specification, wherein Figure 1 is a longitudinal section of one of my improved rolls and Fig. 2 is a corresponding section of the other of said rolls. Fig. 3 is a cross section of the two rolls. Fig. 4 is an end view of a detail of my improvements.

I have not illustrated herein the other parts of a paper bag machine as my present improvements are confined to diverging rolls and their adjuncts.

Roll 2, which may be. the upper roll of the pair, is of hollow construction and is provided with opposite side clips 5, 6 fixed to the outer ends of levers 7, 8 pivoted at9, 10 in opposite ears respectively of inwardly reaching bracket 3. Said levers 7, 8 may be urged toward one another by spring 11 therebetween. In those ends of levers 7, 8

oppbsite clips 5, 6 are pivoted rolls 13, 14

for'engagement by sliding actuators 15, 16, respectively, and which actuators are reciprocated-endwise, as roll 2 revolves, by the engagementof theirrolls 17, 18 with fixed cams 19, 20 respectively. Roll 4, which may be the lower roll, is also of hollow construction and is provided with side clips 21, 22

similar to and mounted and actuated simi larly to side cli s 5 and 6, except that bracket 30 of rol 4 instead of beingfixed relatively to. said roll, as is bracket 3 to its roll, is pivotally mounted in car 31 of roll 4. Pivot 32'0f said bracket30 has its axis respectively. For causing said'bracket 30 tooscillate I provide means comprising, its preferred form, rock shaft 37, pivoted in one end of roll 4 and near. the periphery thereof. Said rock-shaft has fixed to its inner end arm 38 having its bifurcated endv 39 in engagement with outreaching end 40 of bracket 30. The outer end of said rock shaft 37 has fixed thereto arm 41 carrying roll 42 for engagement with fixed cam 43. Coaxial with rock shaft 37 and mounted in the opposite end of roll 4 is rock shaft .44 having fixed to its inner end arm 45 whose bifurcated end 46 engages outreaching end. 47 of bracket 30. provided with spring 145 for urging roll 42, through the connecting mechanism just described, to engagement with cam 43.. Roll 2 may be providedwith the usual pins as 48 for engagement with the upper ply of the bag tube, and roll 4 may be provided with the usual front clip 49 for gripping the lower ply of the leading end of the bag tube to the periphery of said roll. These two devices may be actuated by some suitable well known means but not illustrated herein.

The operation of my ,improved rolls is as follows: The leading end of a tucked paper tube being delivered to the bite of rolls 2, 4 at A in Fig. 3, said rolls are rotated in the direction of their respective arrows. When the bag tube has been advanced between said rolls a suitable distance and when side clips 5, 6 have reached or just passed the common plane passing through the axes of the rolls (Fig. 3) said clips enter the side tucks and grip the upper plies thereof to the face of roll 2. 1 At this time cam roll 42 is on the low part of its cam 43 whereby the side clips of roll 4 are advanced circumferentially in respect of that roll as shown at 22, Fig. 3. This advance is of suficient amount to prevent the collision of side clips 21, 22 in roll 4 with side clipsfi, 6 respectively in roll 2. Said clips 21, 22 are re tained in this circumferentially advanced position until. rolls 2 and 4 have rotated a sufficient additional amount to ermit levers 23, 24 to rotate in clockwise direction, Fig. 3, back to their normal positions without causing the clips on one roll to interfere with the clips respectively on the other roll...

During this clockwise movement of braqlggt 30 and arms 23, 24, side clips 21, 22 have been entering the side tucks of the bagtube and at the instant of the return of said arms 23, 24 to their normal positions said clips close upon the lower plies of the side tucks respectively and grip those plies to the periphery of the roll, and which. gripping takes place on those lower plies directly opposite the points of gripping of the upper plies by clips 5, 6 respectively. Said rolls 2 and 4 then continue their rotation and the diamond fold is opened out in the usual manner.

I claim:

1. In Zipping roll mechanism the COHIblnation of a roll, opposite side clips mounted therein, means for moving said side clips toward and from each other for coaction with the periphery of the roll, and means for moving said side clips circumferentially of said roll.

2. In gripping roll mechanism the combination of a roll, a side clip ff'ame pivotallv mounted in said roll on an axis parallel Wit Said rock shaft 44 is the axis of the roll, opposite side clips pivotally mounted on said frame, means for swinging said side clips on their pivots, and means for swinging said frame on its pivot.

3. In gripping roll mechanism the combi nation of a roll, a side clip frame pivotall mounted in said roll on an axis parallel with the axis of the roll, opposite side clips.pivotally mounted on said frame, means for swinging said side clips on theirpivots, a rock shaft in said roll, means for rocking the rock shaft, and means for swinging the frame from the rock shaft.

4. In gripping roll mechanism the combination of a roll, a side'clip frame pivotally mounted in said roll on an axis parallel with the axis of the roll, opposite side clips pivotally mounted on said frame, means for swinging said side clips on their pivots, a

rock shaft in said roll, a cam fixed relatively to saidroll, means for rocking the rock shaft from the cam, and means for swinging the frame from the rock shaft.

5. In diverging roll mechanism the combination of. a pair of coacting rolls, a panof opposite side clips in each roll, means for .moving the members of each pair of side clips toward and from each other for coaction with the periphery of their respective roll, and means for moving one pair of side clips circumferentially relatively to its roll.

6. In diverging roll mechanism the combination of a pair of coacting rolls, a pair of opposite side cl ps in each roll, means for moving the members of each pair of side clips toward and from each other for coaction with the periphery of their respective roll, a side clip frame pivotally mounted in one of said rolls on an axis parallel with the axis of the roll, the opposite side clips of said roll being mounted on said frame, and means for swinging said frame on its pivot.

7. In diverging roll mechanism the combination of a pair of coacting rolls, a pair of opposite side clips in each roll, means for moving the members of each pair of side clips toward and from each other for coaction with the periphery of their respective roll, a side clip frame pivotally mounted in one of said rolls on an axis parallel with theaxis of the roll, the opposite side clips of said roll being mounted on said frame, a rock shaft in said roll, means for rocking the rock shaft, and means for swinging the frame from the rock shaft.

8. In diverging roll mechanism the combination of a pair of coacting rolls, a pair of opposite side clips in each roll, means for moving the members of each pair of side clips toward and from each other for coaction with the periphery of their respective roll, a side clip frame pivotally mounted in one of said rolls on an axis parallel with the axis of the roll, the opposite side clips of said roll being mounted on said frame, a this 5th day of Dec., 1912, before two subrock shaft in said roll, a cam fixed relativelfy scribing Witnesses. to said roll, means for rocking the rock sha t from the cam, and means for swinging the VILLIAM DULIN 5 frame from the rock shaft. Vitne'sses:

Signed'at Philadelphia, in the county of E. C. CHITTIGH, Philadelphia and State of Pennsylvania, C. WEBSTER MACDOWELL. 

